A special scale inhibitor for TRT and its preparation method and application

Abstract

This invention belongs to the field of scale inhibitor technology. It discloses a special scale inhibitor for TRT (Temperature Reduction Reactor) equipment, its preparation method, and its application. The special scale inhibitor prepared by this invention is composed of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, amino acid ionic liquid, N-methyldiethanolamine, plant extracts, and other raw materials. Under the action of the scale inhibitor prepared by this invention, it can not only rapidly reduce scale deposits on the TRT equipment (stationary blades, moving blades, and internal casing surfaces), but also prevent the formation of salt and dust on the TRT equipment (stationary blades, moving blades, and internal casing surfaces). Simultaneously, it coats the surface of the TRT equipment (stationary blades, moving blades, and internal casing surfaces) with a protective film, reducing the corrosion of the TRT equipment (stationary blades, moving blades, and internal casing surfaces) by acidic gases in the blast furnace gas.

Description

Technical Field

[0001] This invention relates to the field of scale inhibitor technology, and in particular to a special scale inhibitor for scaling in TRT devices, its preparation method, and its application. Background Technology

[0002] TRT is an abbreviation for Blast Furnace Top Gas Pressure Recovery Turbine Unit, also known as a blast furnace gas top pressure turbine power generation device. It is mainly used to recover the pressure and thermal energy of the byproducts (blast furnace gas) generated during blast furnace smelting. It can typically recover 30%-50% of the energy required by the blast furnace blower, resulting in significant economic benefits. It is an energy-saving and environmentally friendly device promoted by steel enterprises.

[0003] Dry dust removal systems for blast furnaces can fully retain the pressure and thermal energy of blast furnace gas, featuring high dust removal efficiency, water and electricity savings, and good gas quality, resulting in significant economic benefits. It has become a widely adopted technology in modern ironmaking. After switching from wet to dry methods, the TRT (Total Thermal Removal Unit) power generation has significantly increased, averaging 20% ​​to 50%, demonstrating substantial economic benefits.

[0004] With the application of oxygen-enriched pulverized coal injection technology, calcium chloride solution injection technology for sintering, and dry dust removal technology in the metallurgical industry, blast furnace gas after dry dust removal still contains moisture and a small amount of salt impurities. After the gas enters the turbine and expands to perform work, its temperature gradually decreases. When it falls below the dew point of water vapor, condensation forms. At this time, some complex components in the gas, such as NH4Cl, when exposed to water and dust at a turbine exhaust temperature below the dew point of their chemical products (80-90℃), precipitate in solid form and adhere to the turbine's moving and stationary blades and the inner wall of the casing. Over time, this forms a solid scale layer, similar to the formation of lava. Measurements show that this scale layer is mainly composed of ammonium chloride (NH4Cl) and ash crystals, and also contains other trace amounts of inorganic salts. During unit operation, as the scale layer continuously accumulates and partially detaches, the turbine rotor's dynamic balance is disrupted, causing excessive vibration and triggering an alarm shutdown. Therefore, regular manual descaling is necessary, requiring the turbine to be cleaned approximately every one to two months. This not only increases the unit's maintenance workload but also wastes a significant amount of residual pressure energy from the blast furnace gas, resulting in substantial economic losses. Furthermore, the blast furnace gas produces various acidic gases (such as H₂S, HCl, and CO₂). Consequently, the final flow entering the TRT unit is a multiphase flow consisting of gas, steam, and solid phases. After the gas enters the TRT unit, its velocity and temperature decrease significantly due to expansion and work. Acidic gases in the gas dissolve in the condensate, forming a thin acidic water film on the blade surface, causing corrosion damage. The corroded metal surface has drastically reduced smoothness, making it easier for corrosion products, oil, dust, and other contaminants to adhere to the blades.

[0005] The most effective solution currently available is the application of scale inhibitors. Patent CN115181978A discloses a scale inhibitor specifically for TRT (Tunneling and Refractories Torque). This TRT-specific scale inhibitor and corrosion inhibitor includes the following components: methyl diethanolamine, imidazoline, benzalkonium chloride, isothiazolinone, sodium polyacrylate, tetrasodium hydroxyethylidene diphosphate, and benzotriazole. Patent CN101353581A discloses a scale inhibitor specifically for wet dust removal blast furnace gas energy recovery turbine devices. The scale inhibitor is composed of the following substances by weight percentage: organophosphonate: 50-60%, dodecyl dimethyl benzyl ammonium chloride: 15-20%, defoamer: 10-15%, and redistilled water: 5%-25%. Existing commercially available mature TRT scale inhibitors also contain organic compounds such as imidazoline or organophosphates. When the TRT inlet temperature drops significantly, such organic matter enters the front-end gas pipeline. As the gas expands and does work, the temperature of the blast furnace gas drops further. The large-molecule organic matter itself is difficult to vaporize, and its fluidity also decreases with the temperature drop. It is easy to stick to the TRT moving blades, which leads to a continuous increase in the vibration value of the unit's main shaft and a shortening of the unit's operating cycle.

[0006] In summary, to ensure the stable operation of the TRT device on site, extend its service life, and reduce the operating costs of steel enterprises, it is urgent to develop a scale inhibitor suitable for conditions where the blast furnace gas outlet temperature is significantly reduced. Summary of the Invention

[0007] In view of this, and in view of the shortcomings of the existing technology, the present invention provides a special scale inhibitor for scaling in TRT devices, its preparation method and application.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A special scale inhibitor for TRT devices is composed of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, amino acid ionic liquid, N-methyldiethanolamine, plant extract, zinc sulfate, acetylsalicylic acid, sodium gluconate, methanol and water.

[0010] In a further technical solution of the present invention, the special scale inhibitor for TRT device scaling is, by weight, the following components: 5-10 parts of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-5 parts of amino acid ionic liquid, 1-5 parts of N-methyldiethanolamine, 1-3 parts of plant extract, 4-5 parts of zinc sulfate, 2-5 parts of acetylsalicylic acid, 3-5 parts of sodium gluconate, 1-4 parts of monoisopropanolamine, 20-25 parts of methanol, and an appropriate amount of water.

[0011] In a further technical solution of the present invention, the plant extract is one or a combination of two of passion fruit peel extract and borneol extract.

[0012] In a further technical solution of the present invention, the plant extract is preferably a combination of two: passion fruit peel extract and borneol extract in a weight ratio of 1:1.

[0013] In a further technical solution of the present invention, the amino acid ionic liquid is tetramethylammonium glycine or tetramethylammonium arginine.

[0014] In a further technical solution of the present invention, the preparation method of the above-mentioned special scale inhibitor for TRT device scaling, wherein the raw materials are taken in the stated weight proportions, includes the following steps:

[0015] S1. Add the plant extract to methanol and stir at room temperature until completely dissolved;

[0016] S2. Add N-methyldiethanolamine and monoisopropanolamine to the solution obtained in step S1 and stir at room temperature for 15-20 minutes.

[0017] S3. Add 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and amino acid ionic liquid to the remaining water, and stir at room temperature until completely dissolved.

[0018] S4. Add the zinc sulfate, acetylsalicylic acid and sodium gluconate mixture to the solution obtained in step S3 and stir for 5-10 minutes.

[0019] S5: Mix the solutions obtained in steps S2 and S4, and continue stirring at room temperature for 40-60 minutes to obtain a special scale inhibitor for TRT devices.

[0020] In a further technical solution of the present invention, the above-mentioned special scale inhibitor for TRT device scaling is applied to inhibit acid gas corrosion and salt-forming substance scaling in the blast furnace gas residual pressure turbine power generation device.

[0021] In a further technical solution of the present invention, the concentration of the special scale inhibitor for TRT device scaling added to the blast furnace gas is 80-130 mL / (10 4 m 3 h).

[0022] As can be seen from the above technical solution, the present invention discloses a special scale inhibitor for scaling in TRT devices, which has the following technical effects compared with the prior art:

[0023] 1. On the one hand, the special scale inhibitor prepared by this invention solves the problem that traditional agents have large molecular weights, are difficult to vaporize, and adhere to the moving blades under the condition of reduced blast furnace gas outlet temperature, leading to increased vibration of the unit's main shaft and shortened unit operating cycle. On the other hand, the scale inhibitor prepared by this invention is added by an automatic dosing metering pump. The dosing port of the gas pipeline is selected 10-15 meters after the quick-cut valve of the gas inlet device. The injected agent is atomized into the gas pipeline by the atomizing nozzle and rapidly vaporized under the action of the gas temperature and flows through the gas. During the process, the agent mixes with the coal gas and enters the TRT unit. Under its action, it not only rapidly removes scale deposits from the TRT unit (stationary blades, moving blades, and internal casing surfaces), but also prevents the formation of salt and dust on these surfaces. Simultaneously, a protective film is formed on the upper surfaces of the TRT unit (stationary blades, moving blades, and internal casing surfaces), isolating the blades from the outside environment and reducing the corrosion of the TRT unit (stationary blades, moving blades, and internal casing surfaces) by acidic gases in the coal gas, thus protecting the blades. This not only ensures the continuous and stable operation of the equipment but also meets the requirement of reducing the frequency of equipment maintenance.

[0024] 2. In the special scale inhibitor formulation prepared by this invention, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide and N-methyldiethanolamine capture and absorb acidic gases in blast furnace gas. This not only helps maintain the interface between monoisopropanolamine and ammonium chloride as an alkaline environment, which is more conducive to scale inhibition, but also has a certain corrosion inhibition effect on the TRT device (stationary blades, moving blades and internal casing surface) due to acidic gas corrosion. At the same time, the added amino acid ionic liquid can further promote the activity of N-methyldiethanolamine, and can better capture and absorb substances such as H2S, HCl, and CO2 generated in blast furnace gas, thereby reducing the corrosion of acidic gases in the gas.

[0025] 3. The special scale inhibitor formula prepared by this invention also includes zinc sulfate, acetylsalicylic acid, and sodium gluconate. When the special scale inhibitor prepared by this invention is added through an automatic dosing metering pump, the acetylsalicylic acid in the formula has a planar structure with electron-rich oxygen atoms and π electrons, which can be adsorbed on the TRT device (stationary blades, moving blades, and internal housing surface), blocking the active sites on the TRT device (stationary blades, moving blades, and internal housing surface) to prevent corrosion in an acidic environment; the carboxyl groups in sodium gluconate can chelate with the iron in the insoluble residue in the deposit at the anode to form a precipitation film that is uniformly adsorbed on the TRT device (stationary blades, moving blades, and internal housing surface) to form a protective film; while zinc ions form a precipitation film at the cathode and play a role in corrosion inhibition; the three work together to better inhibit corrosion.

[0026] 4. Passion fruit peel extract and borneol extract are also added to the formula of this invention as an auxiliary corrosion inhibitor to further protect the blades in the internal device of the TRT, prevent acid corrosion, and extend the service life of the equipment. Detailed Implementation

[0027] This invention discloses a special scale inhibitor for scaling in TRT devices. The special scale inhibitor is composed of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, amino acid ionic liquid, N-methyldiethanolamine, plant extract, zinc sulfate, acetylsalicylic acid, sodium gluconate, methanol, and water. The components, by weight, are: 5-10 parts of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-5 parts of amino acid ionic liquid, 1-5 parts of N-methyldiethanolamine, 1-3 parts of plant extract, 4-5 parts of zinc sulfate, 2-5 parts of acetylsalicylic acid, 3-5 parts of sodium gluconate, 1-4 parts of monoisopropanolamine, 20-25 parts of methanol, and an appropriate amount of water.

[0028] The non-limiting contents of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide are 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts. The 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide here is an imidazolium ionic liquid and is a commercially available product.

[0029] The non-limiting contents of N-methyldiethanolamine are 1 part, 2 parts, 3 parts, 4 parts and 5 parts.

[0030] The non-limiting amounts of the amino acid ionic liquid are 1 part, 2 parts, 3 parts, 4 parts and 5 parts; wherein the amino acid ionic liquid is selected from one of tetramethylammonium glycine or tetramethylammonium arginine.

[0031] The non-limiting contents of the plant extracts are 1 part, 1.5 parts, 2 parts, 2.5 parts and 3 parts; wherein, the plant extracts are preferably a combination of two, namely passion fruit peel extract and borneol extract in a weight ratio of 1:1.

[0032] Passion fruit (Passiflora edulis), belonging to the Passifloraceae family and the Passiflora genus, is native to Brazil. It emits a complex flavor reminiscent of pomegranate, pineapple, and other fruits, and is also known as passion fruit. It is rich in vitamins, dietary fiber, carbohydrates, and other nutrients, and is also extremely rich in bioactive components such as polyphenols, flavonoids, and alkaloids. Passion fruit peel extract is obtained by washing fresh passion fruit peel, drying it in an oven at 130°C, pulverizing it through a 100-mesh sieve, adding the powder to 65 parts of ethanol, ultrasonically treating it in a 35°C water bath for 100 minutes, filtering, concentrating it in a rotary evaporator, and drying it at 130°C to constant weight. Dragon bone grass, also known as Bawangbian (Euphorbia royleana Boiss.), is a plant belonging to the genus Euphorbia. Records indicate that the entire plant and its latex are used medicinally, possessing effects of dispelling wind, reducing inflammation, and detoxifying. Studies have shown that this plant contains phenolic components, diterpenes, triterpenes, and steroidal secondary metabolites. Dragon bone grass leaf extract is obtained by washing fresh dragon bone grass leaves, drying them in a cool, shaded place at room temperature, soaking them in methanol for 48 hours, and then evaporating the solvent under reduced pressure in a rotary evaporator at 40°C.

[0033] The non-restricted contents of zinc sulfate are 4 parts, 4.5 parts, and 5 parts.

[0034] The non-restricted contents of acetylsalicylic acid are 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts and 5 parts.

[0035] The non-restricted contents of sodium gluconate are 3, 4, and 5 parts.

[0036] The non-limiting contents of methanol are 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 and 25 parts.

[0037] The non-limiting contents for monoisopropanolamine are 1 part, 2 parts, 3 parts and 4 parts.

[0038] The above-mentioned N-methyldiethanolamine, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, amino acid ionic liquid, zinc sulfate, acetylsalicylic acid, sodium gluconate, monoisopropanolamine, and methanol are all commercially available products and can be purchased through legitimate channels.

[0039] This invention also discloses a method for preparing a special scale inhibitor for TRT devices, wherein the raw materials are taken in the stated weight proportions, and the method includes the following steps:

[0040] S1. Add the plant extract to methanol and stir at room temperature until completely dissolved;

[0041] S2. Add N-methyldiethanolamine and monoisopropanolamine to the solution obtained in step S1 and stir at room temperature for 15-20 minutes.

[0042] S3. Add 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and amino acid ionic liquid to the remaining water, and stir at room temperature until completely dissolved.

[0043] S4. Add the zinc sulfate, acetylsalicylic acid and sodium gluconate mixture to the solution obtained in step S3 and stir for 5-10 minutes.

[0044] S5: Mix the solutions obtained in steps S2 and S4, and continue stirring at room temperature for 40-60 minutes to obtain a special scale inhibitor for TRT devices.

[0045] The special scale inhibitor prepared in this embodiment of the invention for scaling in TRT devices is used to inhibit acid gas corrosion and salt-forming substance scaling in blast furnace gas residual pressure turbine power generation devices.

[0046] The special scale inhibitor for TRT equipment prepared in this embodiment of the invention is added to the blast furnace gas at a concentration of 80-130 mL / (10) 4 m 3 h).

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The plant extracts described in Examples 1 to 3 below are preferably a combination of two ingredients: passion fruit peel extract and borneol extract in a weight ratio of 1:1.

[0049] Example 1

[0050] A special scale inhibitor for scaling in TRT devices, by weight:

[0051]

[0052]

[0053] The preparation method of the special scale inhibitor for TRT device scaling in Example 1 above includes the following steps, wherein the raw materials are in parts by weight:

[0054] S1. Add the plant extract to methanol and stir at room temperature until completely dissolved;

[0055] S2. Add N-methyldiethanolamine and monoisopropanolamine to the solution obtained in step S1 and stir at room temperature for 15 min.

[0056] S3. Add 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and amino acid ionic liquid to the remaining water, and stir at room temperature until completely dissolved.

[0057] S4. Add the zinc sulfate, acetylsalicylic acid and sodium gluconate mixture to the solution obtained in step S3 and stir for 5 minutes.

[0058] S5: Mix the solutions obtained in steps S2 and S4, and continue stirring at room temperature for 40 minutes to obtain a special scale inhibitor for TRT device scaling.

[0059] Example 2

[0060] A special scale inhibitor for scaling in TRT devices, by weight:

[0061]

[0062]

[0063] The preparation method of the special scale inhibitor for TRT device scaling in Example 2 above includes the following steps, wherein the raw materials are in parts by weight:

[0064] S1. Add the plant extract to methanol and stir at room temperature until completely dissolved;

[0065] S2. Add N-methyldiethanolamine and monoisopropanolamine to the solution obtained in step S1 and stir at room temperature for 20 min.

[0066] S3. Add 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and amino acid ionic liquid to the remaining water, and stir at room temperature until completely dissolved.

[0067] S4. Add the zinc sulfate, acetylsalicylic acid and sodium gluconate mixture to the solution obtained in step S3 and stir for 10 min.

[0068] S5: Mix the solutions obtained in steps S2 and S4, and continue stirring at room temperature for 60 minutes to obtain a special scale inhibitor for TRT device scaling.

[0069] A gas plant's high-voltage generator unit (TRT) officially commenced operation in December 2019. By January 2021, the TRT unit had undergone disassembly, cleaning, and maintenance as many as nine times, averaging less than three months between maintenance visits (mostly for blades, including both moving and stationary blades, where accumulated dust affected rotor balance). In April 2021, the variable frequency speed control system of the stationary blade spray water pump was repaired, and the nozzles were enlarged and replaced, increasing the water pressure to 6 kg / cm². 2 The water volume was increased to the 11th-13th level. Due to vibration, the volume increased again, and the cover was opened for inspection. Dust accumulation was found on the blades. The special scale inhibitor prepared in Example 2 for TRT device scaling was added using an automatic dosing pump at a dosage of 100 mL / (10) 4 m 3 h) Coal gas: The chemical dosing port of the coal gas pipeline is selected 10-15 meters after the quick-cut valve of the gas inlet device. The injected chemical is atomized by the atomizing nozzle and enters the coal gas pipeline. Under the action of the coal gas temperature, it is rapidly vaporized and mixed with the coal gas during the coal gas flow and enters the TRT device. Under the action of the chemical, the scale on the blades is completely decomposed. After the TRT device has been running for 3 months, the vibration value of the main shaft of the unit is still stable, the moving and stationary blades of the unit are covered with an adsorption film, and the blades do not show obvious acid corrosion and scaling. After the TRT device has been running for 10 months, it can still maintain a good corrosion inhibition and scale inhibition effect.

[0070] Example 3

[0071] A special scale inhibitor for scaling in TRT devices, by weight:

[0072]

[0073]

[0074] The preparation method of the special scale inhibitor for TRT device scaling in Example 3 above includes the following steps, wherein the raw materials are in parts by weight:

[0075] S1. Add the plant extract to methanol and stir at room temperature until completely dissolved;

[0076] S2. Add N-methyldiethanolamine and monoisopropanolamine to the solution obtained in step S1 and stir at room temperature for 18 min.

[0077] S3. Add 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and amino acid ionic liquid to the remaining water, and stir at room temperature until completely dissolved.

[0078] S4. Add the zinc sulfate, acetylsalicylic acid and sodium gluconate mixture to the solution obtained in step S3 and stir for 7 minutes.

[0079] S5: Mix the solutions obtained in steps S2 and S4, and continue stirring at room temperature for 50 minutes to obtain a special scale inhibitor for TRT device scaling.

[0080] The special scale inhibitor prepared in Example 3 was used in a TRT unit of a steel plant. White crystalline substances were found adhering to the inner wall of the unit, indicating severe salt accumulation. The agent was added using an automatic dosing pump at a dosage of 120 mL / (10) 4 m 3 h) Coal gas: The chemical dosing port of the coal gas pipeline is selected 10-15 meters after the quick-cut valve of the gas inlet device. The injected chemical is atomized by the atomizing nozzle and enters the coal gas pipeline. Under the action of the coal gas temperature, it is rapidly vaporized and mixed with the coal gas during the coal gas flow and enters the TRT device. Under the action of the chemical, the old scale on the blade surface is quickly removed. After the TRT device has been running for 6 months, the vibration value of the main shaft of the unit is still stable, the unit's moving and stationary blades are covered with an adsorption film, and the blades do not show obvious acid corrosion and scaling. The TRT device can still maintain good corrosion inhibition and scale inhibition effect after 18 months of operation.

[0081] Example 4

[0082] The special scale inhibitors for TRT equipment prepared in Examples 1-3 above were applied to inhibit acid gas corrosion and salt-forming substance scaling in blast furnace gas residual pressure turbine power generation equipment.

[0083] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A special anti-scaling agent for TRT device scaling, characterized in that: 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, amino acid ionic liquid, N-methyl diethanolamine, plant extract, zinc sulfate, acetylsalicylic acid, sodium gluconate, methanol and water; The plant extract is one or a combination of passionflower bark extract and borneol extract; The amino acid ionic liquid is tetramethylammonium glycine or tetramethylammonium arginine; 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide 5-10 parts, amino acid ionic liquid 1-5 parts, N-methyl diethanolamine 1-5 parts, plant extract 1-3 parts, zinc sulfate 4-5 parts, acetylsalicylic acid 2-5 parts, sodium gluconate 3-5 parts, mono-isopropanolamine 1-4 parts, methanol 20-25 parts, and appropriate amount of water.

2. A special-purpose scale inhibitor for scale formation in a TRT device according to claim 1, characterized in that: The plant extract is a combination of passionflower bark extract and borneol extract in a weight ratio of 1:

1.

3. The method for preparing the special scale inhibitor for TRT device scaling according to claim 1 or 2, characterized in that: The method comprises the following steps: Each raw material is taken by weight fraction, S1, the plant extract is added to methanol, stirred at room temperature until completely dissolved; S2, N-methyl diethanolamine and mono-isopropanolamine are added to the solution obtained in step S1, stirred at room temperature for 15-20 min; S3, 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide and amino acid ionic liquid are added to the remaining water, stirred at room temperature until completely dissolved; S4, zinc sulfate, acetylsalicylic acid and sodium gluconate are mixed and then added to the solution obtained in step S3, stirred for 5-10 min; S5: mix the solutions obtained in steps S2 and S4, continue to stir at room temperature for 40-60 min, to obtain a special scale inhibitor for TRT device fouling.

4. Use of a dedicated anti-scaling agent for the scaling of a TRT device according to claim 1 or 2, characterized in that, The special scale inhibitor for TRT device fouling is applied to inhibit the corrosion of acid gas and the scaling of salt-forming substances in the blast furnace gas pressure recovery turbine power generation device.

5. Use of a dedicated scale inhibitor according to claim 4, characterized in that: The special scale inhibitor for TRT device scale is added in the concentration of 80-130 mL / (10 4 m 3 h).

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